Surface treated steel

Abstract

This invention provides a surface-treated steel with high corrosion resistance and a low coefficient of friction. The surface-treated steel of this invention is formed by sequentially configuring steel, a Zn-containing plating layer, and a film. The film contains trivalent Cr and an organosilicon compound, wherein the concentration of the trivalent Cr in the film is 0.30% by mass or more and 15.00% by mass or less. The film exhibits peaks representing amine groups at both 3500 cm⁻¹ to 3300 cm⁻¹ and 1650 cm⁻¹ to 1580 cm⁻¹, as measured using a Fourier transform infrared spectrophotometer (FT-IR).